Molding-machine.



W. LEWIS.

MOLDING MACHINE.

APPLICATION FILED JULY 8. I9I4. 1,157,405. Patented 061.1111915.

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11.19B u w7wq WITNESSES OLUMBIA PLANODEAVH co.,wA:HlNcrroN, D. C

W. LE

MOLDING M APPLICATION FILED .1914. 1,157,405. Patented 0t.19,1915.

2 SHEETS-SHEET 2.

' FIQA 'm /W/; N GA INVENTOR WITNESSES Sem/ 5% t 7a2@ ATTORNEY V/'ILERED LEWIS, HAVERFOR-D, PENNSYLVANIA, ASSIGNOR TO THE TABOR MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

nomine-MACHINE.

To all 'who/m t may concern.'

. chines, of which the following is a true and Be it known that l', WILFRED Lnwis, a citizen of the United States, residing in Haverford, inthe county of Montgomery and State l .of Pennsylvania, iave invented certain new and useful Improvements in Molding-Waeiact description, reference being had to the accompanying drawings, which form a part thereof.

My present invention relates to molding machines, of the type in which the mold forming material is compacted aboutv the patterns by lifting a mold support or table on which the flask, pattern and mold forming material are supported, above, and then allowing the support or table to fall back intor collision with an anvil; and in which fluid pressure means are employed for lifting the mold'support above the anvil.

The object of my invention is to provide improvements in the construction, location and arrangement of the valve mechanism employed in bringing about the operation of the fluid pressure mechanism in such a machine.

Considered in one of its aspects, my invention consists in the provisions made for introducing the pressure fluid into the cylinder ofthe piston and cylinder connection between the anvil and mold support through the latter, and for exhausting the pressure fluid through the anvil. n

My invention also consists in a novel 'form of valve mechanism especially adapted for use in a machine in which the pressure fluid is thus introduced through the mold Specification of Letters Patent.

Application filed July 8, 1914. :Serial No. 849,641.

Patented Oct. 19, 1915.

partly invsection, of a shockless jar molding machine embodying one form of my present invention; Fig. 2 is a sectional elevation taken on a larger scale than Fig. 1, and showing the valve 4mechanism of the machine illustrated in Fig. 1; Fig. 3 is a view taken ksimilarly to Fig. 2, illustrating a modified form of valve mechanism; and Fig. 4 is a sectional elevation of a portion of .a molding machine illustrating the use of the valve mechanism shown in Fig. Q in. a different form of molding machine.

.The molding machine shown in part in Fig. 1, comprises a stationary base A, formed with a cylinder space A receiving the vertically movable floating anvil B, which is formed in turn with a cylinder chamber B receiving the piston C of the mold support member C of the machine. During the arring operation, the mold Vdoes not rest directly upon the member C, in the particular machine shown in Fig. 1, but on a rock over table D, which is pivotally connected to the member C; D representing the shaft of the pivotal connection. In the jarring operation, pressure fluid is alternately admitted to and exhausted from the portion of the cylinder space B below the piston C', and in the mold inverting or rocking over operation and pattern drawing operation, pressure fluid is admitted to and exhausted from the space A in the base A beneath the member B, the relatively large cross lsection of the anvil being thus utilized to obtain the requisite power to roll .the mold over and to drawY the pattern. In the machine shown, the rocking over is effected in part by means of the links and levers E, and ak separate fluid pressure motor P is also provided to assist inthe roll over and pattern drawing operations.

No claims are made herein lon the fea,-

tures of the machine shown in Fig. 1, to

' the chamber B.

the construction, arrangement and location of the valve mechanism directly controlling the'pressure maintained in the lower'end of In the machine shown in Figs. l and E2, the piston C oi the mold'supporting member@ is made'hollow, and'isv divided into an upperchamber C2'and a lower chamber C3 bythe ported valve seat member F. rI`he chamber C2 serves as a por-V tion of the conduit by Awhich compressed Vair 1 or other fluid Vunder pressure is supplied ,Lp

. the machineto bringabout the'jar molding l' .1 operation. n

pipe L is connected` to theupper endofv the As shown in Fig. 1, a flexible chamber C2, and this pipe may be connected,

Vas bythe three-way Vvalve L, either to the'k atmosphere, or to a source of pressure fluid. Communication between the chambers i and C3 is controlled by a valve G, which, as shown, is in the form of a valve disk or washer, secured bythe threaded cap G10 to a member G.V

. with a tluted valve stem` portiony G2 which extendsthrough the port` F in the member F, andforms al guide loosely centering the valve mechanism.` The member G is hollow and is formed with a lower central bore Gi, and an upper communicating bore VVG4 of smaller diameter. Working in the enlarged space G3 is a hollow Vpiston I, having a hollow stem I', which projects through the clo- Ysure for the lower end of the space G3 !'ber B10 forming a portion of the lower `end wall of the chamber B', and communicating through the channel B3 formed in the member B with the cylinder-space A beneath the iioating anvil B. Aspring K interposed betweenvthe lowerend of the member G and the valvemember Itends to spread these members apart at all times. The upper end of the chamber Gsin the member G is at all times in communication with the chamber YC3 through the ports G5.

Working in the axial passage G4 in the -member G,and'in the alined central passage or `passages through the hollowpiston I and its stem I, is a compound pilot valve, made up of relatively movable alined plungers H and HA and H10. The ball H10 normally spaces the members H andi-IA apart, and normally closes the lower end ofi-.an aXial passage Hfformed in the plunger Il.

v'Ihe passage H communicates through a port G11 in the capl member G10 with the chamber C2 at all times.' The axial passage throughthe piston Il and stem I yis formed in three sections of different di ameters; At

.seat I4. Y Y

Yadapted, to seat4 under certain conditions against the annular seat I0. Theenlarged Themember G is formed- The lower end 'of the stem I carriesY the bottom of the upper and larger section Y Y:

is an annular valve seat I3, and atY the bottom of the intermediate section is a valve The member HV forms Va valve upper end oi" the Ymember HAfengages -the seat I4v under certain conditions. VThe stem portion H5 ot'l-the memberV HA is Vfluted.V

In the condition of theV apparatus' shown in the drawings, in which'the plunger HA isVv held in an elevated position relative .totheV .y

pistonI by 'meansof the stopB1'1 carried'by thevalve seat 'membcr' B10, the ,channels in, the luted stem Hsat the periphery V'ofthe' latter, and theports I2`n the Vpiston* stem I connect the exhaustpassage B0 and chamber Y A with the'p'ortioneof thech'amber'G3 be-Y i mail the Apiston i. Vvvheapule piangere n and HA'are permittedto descend, as here-#g inat'tcr described, until. the plunger H` en V- 'Y gages the seat I3, and theY plunger VIV-I Aen-V gages the seat I4, the ports I2establish com-f munication between the lower portion of the chamber G3 and the chamber C2, for at'this time the top of themember HA is below the ports I2 and at such Ya distance below ltheyV lower end of thefplunger H'that the ball H10 does not Aob'structtheV How "of i fluid through the channelH. Y A springt() 'actsV against the upper end ,ofV the; plunger H,

tendingfat all times to depressthe latter.

In Figs.V 1,2 and 3 of the drawings the 'A apparatus is shown inthe condition in which the mold supporting member C is resti-ngen the anvil. In this condition'fot `Lthe "apparatus when the valvememberLA is shifted to admit pressure fluid to the chamber C2,YV this pressure uid can pass freelyn through the port F in themember Fk from the chamber C2 into the chamber C3 to thus'cause the Y' l' piston C to move upwardin the cylinder space B. During the initial upward move-V ment of the'piston C,- the valve Gis held in Y its open position by reason of the'fact that the pressure within the chamber'G3 is less' than vthe pressure withinfthe chamber C0.Vr

This 'samepressure diiizerential also aids in holding the v'pistonI stationary Yduring the spring K, and by sure acting on it.- Y e In the initial upward movement of the piston C the parts H, HA and H10 ofthe pilot valve are-held stationaryi'in the posiv tion shown, by the weight vof the parts, by

' initial upward movement-of the piston. VYInf-115 the constructionl shown, the valvefJ' is thus. held to its seat during the initial upward" i movementY of the mold supporting member i C,'b'y its` own weight, bythe action-of the the unbalanced Y fluid pres-1,120'

ias

the action ofthe spring O, and by the fluid pressure in the chamber C2 Vacting against the upper endof themember H. rAs' the f Y upward movement ot the membery C continues, the washer G0 engages the underside latence ber C lifts the piston I- and valve J, and

eventually opens the 'lower end of the chamber B to exhaust. 'Advantageouslyy the valve member J is so formed that there will be no substantial opening of the chamber B to exhaust until the plungers I-I and HA engage the seats I3 and I4 respectively, and

`the under side of the piston I is subjected lto the supply pressurein the chamber C2.

lll/Then larranged as just described,the initial reduction in pressure in the chamber C3 following the initial opening of the exhaust passage, results in a quick and wide opening movement of the valve member J by the aotion of the supply pressure against the un-v der side of the pistonI. It will be understood that the tension of the spring K is non-existent, or relatively7 low, at the time the upward movement of the piston I in the chamber G3 is thus brought about.

In the particular construction of the valve J illustrated, the provisions made for preventing` the chamber B from being freely opened to exhaust on the initial 'upward movement of the valve member J, comprises ooperating piston and cylinder parts formed on the valve member J and valve seat member B10. As illustrated in the drawing, the valve J is formed with a cylindrical portion J2 below the seat engaging surface J. This cylindrical portion snugly surrounds the valve seat member B10, which is cylindrical. The upper edge of the valve f seat member B10 is rounded, and the valve memberis providedwith a central boss J 3 on its under side, with the result that when the lower edge of the cylindrical portion J2 ,is finally lifted above the cylindrical outer surface of the valve seat` member yand the discharge to exhaust begins, the escaping fluid exerts a lifting force against the valve J tending to move theV latter upward, and not a suction effect on the valve tending'to reseat the latter. After the exhaust from the chamber B is thus opened wide, the mold supporting member C begins to fall, and when this movement is arrested by the collision of the member C and the anvil B, the valve parts are restored to their initial position shown in Fig. 2, and the cycle of operation described is continuously repeated, until the valve L is shifted to disconnect the chamber C2 from thesource of fluid pressure.

AIt will be understood that during the jarring operation, the valve N, in the pipe N leading from the lower end of the space A', is shifted to connect this space to the atmosphere. e 'When the valve N is shifted to admit pressure Huid to the lower end of the chamber A to lift the floating anvil, for the purpose of squeezing the mold, or in the particular machine shown for the purpose of rolling the mold over, and drawing the patterns, the valve J is held against its seat by the spring K, which should be strong enough to overbalance the action of the fluid pressure then acting Yon the under side of the valve. At this time the pressure within the chamber G3 will be equal to the pressure in the chamber A, but this will not affect the apparatus in any way. Y

The spring G should be strong enough to hold the various pilot valve parts H, H10

and HA in the position shown in Fig.

when pressure fluid is introduced into the space A to lift the anvil B. l/Vith the parts of the pilot valve thus held in place, the ball valve H10 will prevent pressure fluid leaking upward past the 'member IIA from escaping through the passage H. In consequence, such leakage must also leak for some distance through the joint between the lower end of the plunger' I-I and the chamber. in the piston I in which it works, before escaping from the valve mechanism. Under these circumstances, the upper end of the plunger HA and the lower end of the plunger Il need not fit with especial snugness in the chambers in which they work to keep the leakage vpast them so small as to be quite unimportant. It is primarily to avoid the necessity for close fitting, elongated, cylindrical surfaces in the pilot valve, that I have formed the pilot valve in the separate parts H, H1" and HA, for with the parts in the position shown in Fig. 2, leakage in either directionfrom the chamber C3 into the eX- haust port through the valve mechanism must pass Asuccessively through the joints between the `lower end of the plunger H vand the rwall surrounding it, and between the upper end of the plunger HA and the wall surrounding it, for the passage H is effectually sealed by the ball valve Hlm. During the final portion of the upward movement of the mold support, and during the major portion of the downward movement of the mold support, appreciable leakage is positively preventedby the engagement of the plungers H and HA with the valve seats I3 Y and I4 respectively. p

It is, of course, not absolutely essential to subdivide the pilot valve as shown; and in Fig'. 3 I have illustrated a construction differing from that shown in Fig. 2 in that the pilot valve L is a one piece plunger having an upper portion of larger diameter and a lower portion of smaller' diameter. The plunger h is formed in its upper portion with an. axial channel z/ which communi-- cates with the chamber G2 through the ports 71.2 formed in the pilot valve, and the ports I2 formed inthe piston IA, under the same conditions in which the channel H of the valve construction shown in Fig. 2 communicates with the chamber G3. The plunger A7L is fo-rmed with an axial channel h in its lower portion which communicates through lateral ports l2. in the plunger with the ports l2 and chamber -G.3, underV the same conditions in Y ywhich communication with the exhaust passpring O is omitted, and theplunger 7L en` sageV is had from the chamber G3 along the iiuted stem of the valve shown in Fig. A. In the valve construction Vshown in- Fig. 3, the

aves the ca .G10 when ressure is introduced belowv the anvil to'raisev thev latter.

Theplunger z, is provided withv avalve'seat engaging .portionY its, which engages the seat I3 under'the same conditionsy in which'the plunger HA engages Ythe seat I3 ofv the construction shown in Fig. 2. In theconstructionlshown in Fig. 3, however, the passage lbf-fis never positively sealed, as it is in the.

Y Vconstruction showny in Fig. 2,l under some conditions by the ball valve H10 and .under Vother Yconditions by the Yengagement, ofthe lower end of the plunger H with Ythe seatV I3.V The pilot valve construction Yshownnin Fig. Sis somewhat simpler than that shown in Fig. 2, but requires va closer fitting of the parts to prevent undesirable leakage.

N oV provisions are made for causing the escaping fluid to exert a lifting action on the exhaust valve yJA of Fig. 3, but thisV valvefis provided with central piston-like:

extension JBO which prevents `the chamber B from being freely opened to exhaust prior mechanism located within the piston C may,

be removed by means ofthe stem F.

It will, of course, be understood that in,

stead of utilizing the chamber C2 in vthe mold supportpiston as the inlet chamber of `the supply valve, as in the construction illustrated, the valve seat member F might form a part of a supply valve casing removably f, mounted within the. chamber C2, and Athis feature of construction is illustrated inV my prioil application, Serial No. 811,131, re-

ferred to above. It will also be apparent, of f course,that the means shown hereinY for regulating tlie'opening and closing ofthe supply port F, might be employed along Vwith independent means for opening andV closing the ymain exhaust from the chamber B, and such an arrangement is also disclosed in my prior application Ser. VNo.V 811,131.V The supply valve operating mech-Y ,anism of saidVV prior application, whileV dif?` f in which kthe anvil BB is formed on itsfupper l.bolted to the support CA `andgclosing Y upper end of the chamber formed'ii'i` the lat# fering in. some respects from the Y supply valve. operating mechanism shown! herein,

embodies variousmovel features disclosed in this application, which containsthe claims x [on the novel featuresgof valve construction disclosed in common bythe two applications.

lVhile in the preferred Vform nofV valve mechanismV illustrated-fherein,` I V.employ springs K and 0it is to be observed Vthat. 'l

the tension of neither of'thesesprings really Vhas anything to do with the normaloperation or timing of the valve mechanism.

These springsare not relied vuponto move Y the lvalve parts against pressuresV opposing such movementsV in normal operation. VOn the contrary, vthe valve mechanism -is V.oper-VL ated by iiuidpressure means, and -avchangef in the supply pressure for-instance does-not' tend to alter the timing orinodeofropera-.ly l Y vr-85 n In Fig.V 4l have shown the `,use of a form';v

tion of thevalve.

of valve mechanism, essentially the sameV as that shown in Fig. .2, ina molding machinel side with the piston VBzojwliicliworks the cylinder C20, formed on the under side of the mold support CA and terminating at its lower end in the anvil engaging or striking shoulder C21. VThe valve seat member'FA, replacing the valve seat member F of Fig. 2, is shaped to forma supply port F,"with a A valve seat surrounding its upper end,l and alsoto provide a valve chamber F10 in which .works the upper portionof the valvemechanism,. e., the valve G proper andcapl G10, which may be, and is shown asl being, identical with that shown in Fig. 2.v The upperV valveseat member FA clamped against its seat in the mold support CA bya plate C22 ter to receive the valve seat member FA.

As shown, the upper end ofthe piston-B;20 i 'l is formed with a chamber B21 receiving the V.lower portion of the valve mech-anism, and n the exhaust outlet B30 leads downwardffrom f.

the lower fend of the chamber B2?. Y The operation' of ,the apparatusv shown in Fig. 4L will be understood without4 further explanation. In Fig. 1, the'valve mecha-'M nism is shown with` the parts inY the 1 posi Vendof thel chamber F10 is closed,.and the Y tionsoccupied byy them immediately after Y the piston ,I has been raisedV by the introduction of the supplypressure" into the chamber G3, to thereby move the exhaust valve into the wide open position. Y

Having now described my invention,what

I claim as new and desire to secure by Let#V ters Patent, is: Y

1. In a jar molding machine, thecombination with'an anviland mold support formed one with, a piston vkand the other with a cylinder inrwhich said piston works,

Vsaid moldl supportbeing formed Vwith a .v

chamber and a supply port opening therefrom to the interior-of said cylinder, of means for supplying pressure fluid tok said chamber and a valve mechanisml comprising partsengaging said anvil and support and thereby actuated by the relative movements of said anvil and support for opening and closing said port.

2. In a jar molding machine, the combination With an anvil and mold support formed one with a piston and the other with a cylinderV in which said piston Works, said mold support being formed With a chamber and a supply port opening therefrom to the interior oi' said cylinder, of means for supplying pressure lluid to said chamber and a valve mounted in said mold support and controlling said' port and having a depending stem engaging the anvil and holding said valve open when the mold support is ,in its lower positions.

3. n a ljar molding machine, the combination with an anvil and mold support formed one With a piston and the other with a cylinder in which said piston Works, said mold support being formed with a chamber and' a supply port opening therefrom to the interior of said cylinder, of means for supplying pressure fluid to said chamber and a valve member mounted iny said mold support and controlling said port and having a depending stem of adjustable length adapted When contracted in length to engage the anvil and `hold said valve open lwhen the mold support is in its lowermost position, and provisions for elongating said stem during an initial upward movement of the piston to maintain said engagement and keep the valve open. l

4. In a jar molding machine, the combin aticn with an anvil and mold support formed one with a piston and the other With a cylinder in Which said piston Works, said mold support being formed With a chamber and a supply port openingtherefrom to the interior ot' said cylinder, of means for supplying pressure fluid to said chamber, and a valve member mounted in said mold support and controlling said port and having a `depending stem comprising cooperating piston and cylinder elements whereby the length of said stem may be varied, said stem When contracted in length engaging the anvil and holding said valve open when the mold support is in its lowermost position, and provisions. for maintaining pressures at the opposite sides of said piston element to effect an elongation of said st em sufficient to maintain its engagement with the anvil and thereby to keep said valve open on an initial movement of the mold support. v

5, In a jar molding machine, the com-bination with the anvil and molding support- ,f iris parte sae of Whi'h SrrQvd-d with e port, of a valve member controlling said port and having a valve stem extending into engagement With the other part and comprising a piston and cylinder and means for subjecting one side of the piston first to the pressure at one side, and then to the pressure at the other side of said port to automatically vary the length of said stem.

6. ln a jar molding machine, thecombination With an anvil and mold support formed one with a pistonr and the other With a cylinder in Which said piston Works, said. mold support being Aformed With a chamber and a supply port opening therefrom to the interior of said cylinder, of means for supplying pressure duid to said chamber, and a valve member mounted in said mold support and controlling said port and having a depending stem comprising cooperating piston and cylinder elements whereby the length or" said stem may be adjusted, said stem in its contracted condition engaging the anvil and holding the valve open When said mold support is in its lovvermost position, and provisions for subjecting one side of said piston element to the pressure prevailing at the outlet side of said port and for subjecting the other side of said piston to a loiver pressure to thereby elongate said stem and maintain its engagement with the anvil and keep the valve open during an initial upward movement of the mold support.

7. In a jar molding machine, the combination With an anvil and mold support formed one with a piston and the other With a cylinder in which said piston Works, said mold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for supplying pressure fluid to said chamber', a supply valve mounted in said mold support and controlling said supply port and lhaving a depending stem, an exhaust valve carried by said stem Which engages the anvil and closes said exhaust port and thereby holds said supply valve open when the mold support is in its lower positions.

8. In a jar molding machine, the combination with an anvil and mold support formed one with a piston and the other with a cylinder in Which said piston Works, said mold support being formed with a chamber and a supply port 'opening therefrom to the interior of said cylinder and Vsaid anvil being formed With an exhaust passage leading from said cylinder, of means for supplying pressure iluid to said chamber, a supply valve mounted in said `mold support and controlling said port and having a dependin stem of adjustable length, an exhaust valve controlling said exhaust port 'carried by said stem, the latter being adapted when contracted in length to engage the anvil and hold said supply valve open and said exhaust valve closed lwhen the mold support is in its lowermost position, and provisions for elongating said stem during an initial upward movement of the piston to keep the supply valve open andthe exhaust valve closed, and for subse quently contracting said stem. i

9. In a jar molding machine, the combination withan anvil and mold support formed 'one with a piston and the other with a cylinder in which-said piston works, said mold support being formed with a chamber and f a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for supplying pressure fluid to said chamber, and a supply Valve mounted in said mold support and controlling-saidV supply'port and having a dependingstem comprising coperating piston and cylinder elementsV whereby the length of said stem may be adjusted, an exhaust-valve carried at the lower end of said stem, said stem in its contracted condition engaging the anvil when said mold support Vis in itslowermost position tothereby close ksaid exhaust port and hold the supply valve Y openV and provisions for subjecting one side and a supply port opening therefrom to the linterior of said cylinder and said anvil be` ing formed with an exhaust passage leading from said cylinder, of means for supplying pressure fluid to said chamber, a supply valve mounted in said mold support and controlling said supply port and having a depending stem'of adjustable length, an, exhaust valve carried by said stem at its lower end which engages the anvil and closes said exhaust port while holding said supply valve' open when the mold support is in its lowermost position, and means for increasing the length of said stem during the initial up- Vward movement of the piston to keep the supply valve open and the exhaust valve closed and Vfor thereafter shortening Vsaid j stem to thereby further open said exhaust valve. Y

' fil. In a jarmolding machine, the combination with an anvil and mold support formed one withv a piston andthe other with a cylinder in which said piston works, said- -mold 4support being formed with a chamber and a supply port openingtherefrom to the interior of said cylinder and said anvil being formed with an exhaust'passageleading from said cylinder, of means for supplying pressure fluid to said chamber, and a supply valve mounted in said mold support and controlling said supply port and having a depending stem comprising cooperating piston and cylinder elements whereby the length of said stem may be adjusted, an exhaust valve carried at the lower end of said stem, said stem in its contracted condition engaging the anvil when said mold support I is lin its lowerinost position to thereby close said exhaustv port and hold the supply valve open. and provisions vfor continuously subjecting 'one side'of said piston element to the pressure prevailing at the outlet side of said port andforsubjecting the other side of said piston-to a lower pressure to thereby velongate said stem during an initial upward movement of the mold'support and for subsequently subjecting Vthe last mentioned side to the supply pressure to thereby contract the stem. Y l p 12. In-a jar molding machine,the combination with Van anvil and mold support 'formed one with a piston `and the'other with a cylinder in which saidpiston works, saidl Vmoldsupport being formed with a chamber and a supply portopening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder,of means for supplying pressure fluid to said chamber and a valve mechanism comprising valves for said ports i engaging said anvil and support and thereby actuated by the relative movements of said anvil and support for opening and cloising said ports as required to maintain Vsaid v movements. v v Y 13. In a jar molding machine, the combination with 'an anvilv and mold support formed one withA a piston and the other with a cylinder in which said piston works, said mold support being formed with a chamber anda supply port opening therefrom tothe interior of said cylinder and Ysaid anvil being formed with an exhaustpassage leading from said cylinder, of means for supplying pressure Huid to said chamber and a valve mechanism 4for opening and closing saidV l n ports, said valve` mechanism comprising a supply valve andpan exhaustJvalve at. the ,l

opposite ends of a connecting stem. 'A

14:. In a jar molding machine, the combii nation with an anvil andk Inold support formed one witha piston andthe other with a cylinder in which said pistonivorks, said 4Vmold support being formed with a chamberY and a supply port opening therefrom to the interior of said cylinder andrsaid anvil be ingformed with an exhaust passage leading yfrein said cylinder; of means for supplying pressure fluid to said chamber and a valve mechanism for opening and closing said ports, said valve mechanism comprising a supply valve and an exhaust valve at the opposite ends of a connecting stem adjustable in length and means for automatically adjusting the length of said stem on each reciprocating movement of said piston.

15. ln a jar molding machine, the combination with an anvil and mold support formed one with a piston and the other with a cylinder in which said piston works, said mold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, oi means for supplying pressure iuid to said chamber and a valve mechanism for openingand closing said ports, said valve mechanism comprising a supply valve and an exhaust valve at the opposite ends of a connecting stem adjustable in length and liuid pressure means responsive to pressure differences existing in said machine for automatically adjusting the length of said stem on each reciprocating movement of said piston.

16. In a jar molding machine, the combination with an anvil and mold support formed one with a piston and the other with a cylinder in which said piston works, said mold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for supplying pressure fluid to said chamberl and a valve mechanism comprising a valve member controlling said supply port, a valve member controlling said exhaust port and a connecting stem comprising coperating piston and cylinder elements whereby the length of said stem may be varied.

17. ln a ar molding machine, the combination with an anvil and mold support formed one with a piston and the other with va cylinder in which said piston works, said mold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed withv an exhaust passage leading `I"rom said cylinder, of means for supplying pressure Huid to said chamber and a valve mechanism comprising a valve member controlling said supply port, a valve member controlling said exhaust port and a connecting stem comprising relatively movable elements whereby the length of said stem may be varied, and resilient means acting between said piston and the last Ymentioned valve member for holding the latter seated on an increase in pressure at .the outlet side of the exhaust port.

18. In a jar molding machine, the combiformed one with a piston and the other with a cylinder in which said piston works, said mold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for supplying pressure fluid to said chamber and a valve mechanism comprising a valve member controlling said supply port, a valve member controlling said exhaust port and a connecting stem comprising coperating piston and cylinder elements whereby the length of said stem may be varied, and a pilot valve mounted in said valve mechanism and regulating the pressure in one end of said cylinder element.

19. ln a ar molding machine, the combination with an anvil and mold support formed one with a piston andthe other with a cylinder in which said piston works, said mold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for supplying pressure iuid to said chamber and a valve mechanism comprising a valve member controlling said supply port, a valve member controlling said exhaust port and a connecting stem comprising cooperating piston and cylinder elements whereby the length of said stem may be varied, one end of said piston element being exposed to the pressure in the lower end of the anvil cylinder and means for subjecting the other end of saidpiston element alternately to pressures of different intensity to thereby elongate said stem in one stage of each reciprocating movement of Vthe mold support and to shorten said stem in another portion or" said movement.

:20. In a jar molding machine, he combination with an anvil and mold support formed one with a piston and the other with a cylinder in which said piston works, said mold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for supplying pressure fluid to said chamber and a valve mechanism comprising a valve member controlling said supply port, a valve member controlling said exhaust port and a connecting stem comprising cooperating piston and cylinder elements whereby the length of said stem may be varied, one end of said piston element being subjected to the pressure in the lower end of said anvil cylinder and means for alternately subjecting the other end yof said piston element to the pressure on the outlet side of said exhaust port and to the pressure on the inlet side 0i' said supply port.

2l. in a ar molding machine, the combination with an anvil and moldy support v formed one with a piston and the other with a vcylinder in which said piston works, said vmold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for supplying pressure fliud to said chamber and a. valve mechanism comprising a Valve member controlling said Vsupply. port, a valve member controlling said exhaust port and a connecting steni comprising cooperating piston and cylinder elements whereby the length'of said stem may be varied, and a pilot valve mounted in said valve mechanism and regulating the pressurefin one, end

of said cylinder element.

22. ln a jar molding machine, the combination with an anvil and mold support formed one with a piston Vand the other with ac vlinder in which said piston works, said mold support being formed with achamber Y anda supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaust passage leading from said cylinder, of means for vsup- `Vplying pressure fluid to saidchamber and a valve mechanism comprising a-valve member controlling said supply port, a valve member controlling said exhaust port and a `connecting stem comprising coperating piston and cylinder Y elements whereby the length of said stem may be varied, each valve and its stem portion beingY formed with a passage, said passages communicating at their inner ends with one another andV ymold support being formed with a chamber and a supply port opening therefrom to the interior of said cylinder and said anvil being formed with an exhaustpassage leading from said cvlinder, of means for supplying pressure fluid to said chamber and a valve mechanism comprising a'valve member controlling said supply port, av valve member controlling'said exhaust port Vand a connecting stem comprising coperating piston and cylinder elements whereby the length of said stem may Vbe varied, Veach valve and its stem portion being formed with a passage, fsaid passages communicating at their inner ends with one another and with said-chamber'and opening at their'opposite ends at opposite sides'of the two valves, and a'pilotrvalve working in said passages and controlling communication with said chamber through said passages said pilot valve being formed in relatively Y movable sections.

24. In a jar molding machine, thek combi- V nation with an anvil ,andV mold support formed one with a piston and the other with 'a cylinder in whichA said piston works, said mold support being formed with a chamber and a Isupply port opening therefrom to the,

interior of said cylinder and said anvil being `'forme-d with an exhaust passage leading from said cylinder, of means for supplying pressure fluid to said chamber and a valve mechanism' mounted in said mold support and comprising a valve member controlling'said `supply port, a valve member controlling said 'exhaust port vand a connecting stem *com-V prising a stem portion formed with a piston chamber `and a. vstem portion formed witha piston working iiifsaidV chamber whereby the length of ysaid stem Vmay be varied, said valves, and stem portions being formed with alined passages communicatposite ends atV opposite sides of the two valves, and a pilotvalve controlling com- K said pistonV ychamber throughsaid passages, said valve mechanism:

munication with including provisions Vwhereby said pilot valve is urged toward saidanvil, said pilot valve engaging the mold support and'being thereby adjusted relative 'to said valves as the mold support moves into its lowermost position. Y Y

25. In a j ar molding machine, the combination with an Vanvil and mold support soY ing at their inner ends with one anotherand 1 with said chamber and opening at their opformed one with a piston and t-he other with Y a cylinder in which said piston-works, said mold support being formed with a chamber and a supply port opening therefrom to the interior rof saidV cylinder and said anvil ,being formed with an exhaust passage lead- Ving from said cvlinder, of means for sup-V plving pressure fluid to said chamber and a valve mechanism comprising a valve member controlling said vsupply port, a valve member controlling said exhaust port and a connecting stem comprising coperating pis- 115 ton .and cylinder elements whereby the length of said stem may be varied, said valves and their stem portions being formed with passages communicating-at their-inner ends with one another and with saidY chainber and openingrat their-opposite' ends atf Voppositesides vof the two valves and a pilot valve working in said passages and adapted 3 to close one of said Ypassages and open theV other inonevposition and in a second posi-V tion tofopen the Vpreviously closed passage fand close the previously open passage.

f 26. In aja-r molding machine, the combination with Y an `anvil 'and mold,V support lanant kfol-med one .with a piston andthe .other with a cylinder ingwhich said piston works, said ingV from said cylinder, of means vfor supplying pressure fluid to said chamber and a valve mechanism comprising a vvalve member controlling said supply port, a valve member controlling ksaid exhaust aport and a connecting stem comprising coperating piston and cylinder elements whereby the length of said stem may Ybe varied, said valves and their' stem portions being formed with passages communicating vat their inner ends with one another and with said chamber and openingat their opposite ends at opposite sides of the two valves and a pilot valve working in said passages and comrisinff' two lunO'ers-and an intermediatel member, said pilot valve being movable from one position in which said intermediatemembe-r spaces the two plungers apart and coacts with one of them to close one yof said passages while the other issopen into a second position in which said other plunger closes said other passage and no longer holds the intermediate member against the other plunger and the previously closed pas-sage is open. Y Y W 27.1n a jar molding machine, the combination with an anvil and mold support formed one with a piston and the other with a cylinder in which said piston works, said mold support being formed with a chamber y 1 and a supply' port opening therefrom to the `ton Vand lcylinder elements wherebyy they interior oi said cylinder and said anvil .being formed with an exhaust passage lead- I ing from 'said cylinder, ot means for supjr plying pressure fluid to said chamber and la valve mechanism comprising a valvey member .controlling said supply port, a valve member controlling said exhaust port and' a connecting stem comprising'coperating pislength of said stem maybe varied, said valves andtheir stem portions being formed with passages communicating at their inner ends with one another and with said chamber and opening at theiropposite 'ends ,atl

*ate member spaces the twoplungers lapart Aand coactswith one of them to close one of said passages while the other is-open into a second positionin which said other plunger closes said other passage and no longer Y holds the intermediate member againstthe other plunger and the previously closed pas-l .sage is. open, each ofsaid plunger-s being nationV with mold-,support and anvil members iormedonewith a piston and the other with ,a cylinder in which the pistonvworlrs and having an lexhaust outlet from said cylinder formed in one of said members, of

lmechanism controlling the admission to and exhaust from said cylinder of a pressure fluid to eilect alternate movements of separation and approach of said members, in- -K cluding a valve controlling said outlet and having 'a stem adjustable in length connecting it tov the other of said members7 and means for elongating said stem during the initial portion of each movement of separation and thereafter shortening said stem.

In a jar molding machine, thecombi- .nation with mold support and anvil members formed one with a piston and the other with a cylinder in which the piston works and having an exhaust outlet from said cylinder formed in oneof said members, of

mechanism controlling theadmiss'ion to and exhaust from said cylinder of a pressure fluidV to effect alternate movements or"A separation and approach of said members, including a valve controlling said outlet and having a stem adjustable in length connecting'it to the other of said members, said valve and the portion adjacent thefoutlet of the member in which the' outlety is formed being shaped to cause the Vescaping fluid to act kinetically on the #valve when the outlet is open in a direction tending to keep the outlet open. v v

30. In a jar molding machine, the combination with mold support and anvil members formed one witha piston and the other with a cylinder in which the piston works and havinganl exhaust outlet from said cylinder formed in one of said members, of

j mechanism controlling the admission to and exhaust Vfrom said cylinder 'of ya pressure uidto'eicect alternate movements of separation'and approach of' said members, including a valvecontrolling said outlet and having avstem connecting it toV the other of soV said members, said valve and the portion adjacent the outlet of the member in which the outlet is 'formed being shaped to l provide Vtelescoping portions whereby said outlet is not freely opened until after an initial movement ofthe valve relative to the outlet has occurred.

3l. In a jar molding machine the combinal tion with mold support and anvil members formedz one with a piston and the other with a cylinder in which the piston works and having an inlet port to said cylinder formed in one of said members and an exhaust out- A *Y ,5 movements of separation and approach'of 10 f l n Y v i 71,157,405?

let from said cylnder'formed inthe other'rtheleng't'h of-said sten.nonediieetion-dr# 10 Y of said members5'of mechanism VVcontrollii'igg; ingwthe initialfp'rtion 'of eahmveinent'foff lthe admission to and'exhaust from said-cylseparation' and Vfor 'thereafter yvai-'ying .thef inders of a pressure uid to effect alternate lengthofisaid Vstelnfin the oppsite direction?? said members, `said'mechanism including re1' e f atvely movablel valves controlling said ports.v Witnesses: Y and connected to oneanotherby astem ad? ARNOLD `KATZ,"

f' justableV in 1ength,'and means for: Varying D. STEWART.'

' (ivoiesyof this patent maybe oni-mined foi rve centseacli, by addressing` fhe"Govmmius-sivoner gf Patentyjg Y f y Washingtomnc. A l 

